docs: def _fusion_range_to_dsl(tokens) -> FusionRangeBase:
      """Convert a PyParsing data dictionary into a PyBEL.
  
      :type tokens: ParseResult
      """
      if FUSION_MISSING in tokens:
          return missing_fusion_range()
  
      return fusion_range(
          reference=tokens[FUSION_REFERENCE],
          start=tokens[FUSION_START],
          stop=tokens[FUSION_STOP]
      )